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Liabilities - Customer Deposits and Deferred Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Liabilities    
Customer deposits and deferred revenue $ 26,600 $ 28,300
Changes in deferred revenue    
Beginning balance 44,415  
Deferral of revenue 792  
Recognition of previously deferred revenue (2,887)  
Ending balance $ 42,320